CN116867437A - Intraoral imaging system and imaging device - Google Patents
Intraoral imaging system and imaging device Download PDFInfo
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- CN116867437A CN116867437A CN202280014216.6A CN202280014216A CN116867437A CN 116867437 A CN116867437 A CN 116867437A CN 202280014216 A CN202280014216 A CN 202280014216A CN 116867437 A CN116867437 A CN 116867437A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 356
- 238000001514 detection method Methods 0.000 claims abstract description 89
- 230000005855 radiation Effects 0.000 claims abstract description 81
- 238000012544 monitoring process Methods 0.000 claims abstract description 80
- 210000000214 mouth Anatomy 0.000 claims description 25
- 238000000034 method Methods 0.000 description 46
- 238000004891 communication Methods 0.000 description 30
- 238000012545 processing Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 16
- 238000009825 accumulation Methods 0.000 description 8
- 230000020169 heat generation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000006872 improvement Effects 0.000 description 5
- 230000001629 suppression Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- A61B6/512—
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
- A61B6/425—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using detectors specially adapted to be used in the interior of the body
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
- A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure
Abstract
The intra-oral imaging system includes an imaging device and a control device. The imaging device includes an imaging unit, a control unit, and a housing that houses the imaging unit and the control unit. The imaging unit performs imaging detection for detecting radiation to acquire an image of an object and monitoring detection for detecting radiation to monitor a dose of radiation. The control unit transmits an imaging signal acquired by the imaging detection and a monitoring signal acquired by the monitoring detection to the control device. The control device receives the imaging signal and the monitoring signal, and transmits a control command generated based on the monitoring signal to the control unit. The control unit controls the imaging unit in accordance with the control instruction.
Description
Technical Field
The present invention relates to an intraoral imaging system and an imaging apparatus.
Background
Imaging devices that detect radiation transmitted through an object in a state of being disposed in the oral cavity are known. In such an imaging apparatus, the dose of radiation is monitored, and if the dose of radiation is lower than a predetermined threshold value, detection of radiation for acquiring an image of the object (that is, imaging of the object) is ended. However, since the total dose of radiation necessary to properly acquire an image of an object differs depending on the type of object (anterior teeth, posterior teeth, etc.) and/or the type of imaging method (parallel method, bisection method, bite method, etc.), if imaging of an object is ended based on only the dose of radiation, there is a case where an image of an object cannot be properly acquired. Therefore, in the imaging device described in patent document 1, a control module is provided separately from a sensor used in a state of being disposed in the oral cavity, the sensor transmits a signal concerning the dose of radiation to the control module, and the control module analyzes the signal to determine the end timing of imaging the object.
Prior art literature
Patent literature
Patent document 1: japanese patent No. 5715960
Disclosure of Invention
Problems to be solved by the invention
However, in the imaging device described in patent document 1, since it is assumed that a control module provided separately from the sensor is connected to a control device such as a PC, there is a concern that the control module becomes an obstacle or the like when the sensor is disposed in the oral cavity, and the operability of the imaging device is low. On the other hand, for example, when the sensor and the control module are housed in a single case, although the operability of the imaging device is improved, analysis of a signal concerning the dose of radiation is performed in the control module disposed in the oral cavity, and there is a concern that the imaging device in the oral cavity generates heat.
The purpose of the present invention is to provide an intraoral imaging system and an imaging device that can achieve proper acquisition of an image of an object, improvement in operability of the imaging device, and suppression of heat generation of the intraoral imaging device.
Technical means for solving the problems
An intraoral imaging system according to an aspect of the present invention includes: an imaging device configured to detect radiation transmitted through a subject in a state of being disposed in an oral cavity; and a control device electrically connected to the imaging device, the imaging device comprising: an imaging section that detects radiation; a control unit configured to be communicably connected to the control device and to control the imaging unit; and a housing that houses the imaging unit and the control unit, wherein the imaging unit performs 1 st detection of detecting radiation for acquiring an image of the object and 2 nd detection of detecting radiation for monitoring a dose of radiation, the control unit transmits a 1 st signal acquired by the 1 st detection and a 2 nd signal acquired by the 2 nd detection to the control device, the control device receives the 1 st signal and the 2 nd signal and transmits a control instruction generated based on the 2 nd signal to the control unit, and the control unit receives the control instruction and controls the imaging unit in accordance with the control instruction.
In the intraoral imaging system, the control device receives the 2 nd signal concerning the dose of radiation, transmits a control instruction generated based on the 2 nd signal to the control unit, and the control unit receives the control instruction and controls the imaging unit in accordance with the control instruction. Thus, for example, the end timing of imaging of the object can be determined according to the type of the object and/or the type of the imaging method, and as a result, the image of the object can be acquired appropriately. In the intraoral imaging system, the imaging unit and the control unit are housed in a case. This can avoid problems that occur when the control unit and the imaging unit are provided separately, that is, problems that the control unit becomes an obstacle when the imaging unit is disposed in the oral cavity. In the intraoral imaging system, generation of a control command based on the 2 nd signal regarding the dose of radiation is performed in the control device. This reduces the processing load on the control unit on the image pickup apparatus side, and as a result, the image pickup apparatus can be miniaturized and heat generation of the image pickup apparatus can be suppressed. As described above, according to the intraoral imaging system, it is possible to achieve appropriate acquisition of an image of a subject, improvement in operability of an imaging device, and suppression of heat generation of the imaging device in the oral cavity.
In the intraoral imaging system according to one aspect of the present invention, the control device may generate an image of the object based on the 1 st signal. This enables an image of the object to be reliably generated.
In the intraoral imaging system according to one aspect of the present invention, the control command may include an end command for ending the 1 st detection, and the control unit may control the imaging unit to end the 1 st detection when receiving the end command. Thus, for example, the detection of the radiation for acquiring the image of the object can be completed at an appropriate timing according to the type of the object and/or the type of the imaging method, and as a result, the image of the object can be acquired appropriately.
In the intraoral imaging system according to one aspect of the present invention, the control device may generate the end instruction when the total dose of radiation calculated based on the 2 nd signal exceeds a predetermined threshold. Thus, for example, the detection of the radiation for acquiring the image of the object can be completed at an appropriate total dose according to the type of the object and/or the type of the imaging method, and as a result, the image of the object can be acquired appropriately.
In the intraoral imaging system according to one aspect of the present invention, the control device may store a threshold value for each imaging condition of the subject, receive an input of the imaging condition, and set a threshold value corresponding to the imaging condition. Thus, since an appropriate threshold value is set according to the inputted imaging condition, for example, an image of the object is appropriately acquired regardless of the type of the object and/or the type of the imaging method.
In the intraoral imaging system according to one aspect of the present invention, the control device may receive imaging conditions including object information about the object, and set a threshold value corresponding to the object information. Thus, since an appropriate threshold value is set according to the object to be imaged, the image of the object can be appropriately acquired regardless of the type of the object.
In the intraoral imaging system according to one aspect of the present invention, the control device may receive imaging conditions including imaging method information on an imaging method of the subject, and set a threshold value corresponding to the imaging method information. Accordingly, since an appropriate threshold value is set according to the imaging method of the object, the image of the object can be appropriately acquired regardless of the type of the imaging method.
In the intraoral imaging system according to one aspect of the present invention, the control unit may be configured to be communicable with the control device via a wire. This ensures a stable communication environment between the control unit and the control device. Further, since the imaging unit and the control unit are housed in a single housing, even in a configuration in which the control unit and the control device are physically connected by a wire, it is possible to avoid problems such as the control unit becoming an obstacle when the imaging unit is disposed in the oral cavity.
An imaging device according to an aspect of the present invention is an imaging device for detecting radiation transmitted through an object in a state of being disposed in an oral cavity, comprising: an imaging section that detects radiation; a control unit configured to be communicably connected to the control device and to control the imaging unit; and a housing that houses the imaging unit and the control unit, wherein the imaging unit performs a 1 st detection of detecting radiation for acquiring an image of the object and a 2 nd detection of detecting radiation for monitoring a dose of radiation, and the control unit transmits a 1 st signal acquired by the 1 st detection and a 2 nd signal acquired by the 2 nd detection to the control unit, receives a control instruction from the control unit, and controls the imaging unit in accordance with the control instruction.
In the imaging device, the control unit transmits the 2 nd signal obtained by the 2 nd detection to the control unit, receives a control command from the control unit, and controls the imaging unit in accordance with the control command. Thus, for example, the control device can determine the end timing of imaging the object based on the 2 nd signal according to the type of the object and/or the type of the imaging method, and as a result, can appropriately acquire the image of the object. In the imaging device, the imaging unit and the control unit are housed in the case. This can avoid problems that occur when the control unit and the imaging unit are provided separately, that is, problems that the control unit becomes an obstacle when the imaging unit is disposed in the oral cavity. In the imaging device, the generation of the control command is performed by the control device. This reduces the processing load on the control unit on the image pickup apparatus side, and as a result, the image pickup apparatus can be miniaturized and heat generation of the image pickup apparatus can be suppressed. As described above, according to the imaging device, it is possible to achieve appropriate acquisition of an image of a subject, improvement in operability of the imaging device, and suppression of heat generation of the imaging device in the oral cavity.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide an intraoral imaging system and an imaging device capable of achieving appropriate acquisition of an image of an object, improvement in operability of the imaging device, and suppression of heat generation of the intraoral imaging device.
Drawings
Fig. 1 is a block diagram of an intraoral imaging system according to an embodiment.
Fig. 2 is a sectional view of the image pickup apparatus shown in fig. 1.
Fig. 3 is a block diagram of the image pickup apparatus and the control apparatus shown in fig. 1.
Fig. 4 is a sequence diagram showing a flow of processing from the reception of an imaging condition to the start of imaging detection in the imaging processing.
Fig. 5 is a sequence diagram showing a flow of processing from generation of the 1 st start instruction of the 2 nd time to acquisition of an image of an object in the image capturing process.
Fig. 6 is a flowchart showing a flow of the threshold setting process.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and redundant description thereof is omitted.
[ Structure of intraoral imaging System ]
As shown in fig. 1, the intraoral imaging system 100 includes an imaging device 1 and a control device 10. The imaging device 1 detects radiation (for example, X-rays) transmitted through an object such as a tooth in a state of being placed in the oral cavity. The imaging device 1 is electrically connected to the control device 10 via a cable 9 included in the imaging device 1. The image pickup apparatus 1 and the control apparatus 10 perform transmission and reception (i.e., communication) of signals and the like via the cable 9. The control device 10 is constituted by a computer device such as a PC or a tablet terminal. In the intraoral imaging system 100, when radiation transmitted through an object is detected by the imaging device 1, an electrical signal generated by the detection is transmitted from the imaging device 1 to the control device 10, and an image (radiation-transmitted image) of the object is generated by the control device 10 based on the electrical signal.
[ Structure of image pickup device ]
As shown in fig. 2, the imaging apparatus 1 has a wiring board 2, an image sensor 3, FOP (Fiber Optical Plate (fiber optic plate)) 4, a scintillator 5, a control circuit 6, a communication module 7, a housing 8, and a cable 9. The image sensor 3 is mounted on one principal surface of the wiring board 2. The image sensor 3 is, for example, a solid-state imaging element such as a cmos image sensor. The FOP4 is disposed on the image sensor 3. The scintillator 5 is disposed on the FOP 4. The imaging device 1 receives power supply from a control device 10 (see fig. 1) via a cable 9, for example.
The control circuit 6 and the communication module 7 are mounted on the other main surface of the wiring board 2. The control circuit 6 is configured by an integrated circuit such as an FPGA (field-programmable gate (field programmable gate array)), an ASIC (Application Specific Integrated Circuit (application specific integrated circuit)), a CPLD (Complex Programmable Logic Device (complex programmable logic device)), and a CPU (Central Processing Unit (central processing unit)). The control circuit 6 performs various controls in the image pickup apparatus 1. The communication module 7 communicates with the control device 10 according to an instruction of the control circuit 6. The communication module 7 receives various data transmitted from the control device 10. The communication module 7 is an integrated circuit such as a USB (Universal Serial Bus (universal serial bus)) controller. As an example, the communication module 7 is a USB controller, and communicates with the control device 10 according to the USB standard.
The housing 8 houses the wiring board 2, the image sensor 3, the FOP4, the scintillator 5, the control circuit 6, and the communication module 7. Of the wall portions of the housing 8, the wall portion 8a along the scintillator 5 is a wall portion on which incidence of radiation is predetermined. The end of the cable 9 penetrating the wall of the housing 8 opposite to the wall 8a is electrically connected to the wiring board 2. As an example, the cable 9 is a USB cable.
As shown in fig. 3, the imaging apparatus 1 includes an imaging unit 20 and a control unit 30. The image pickup section 20 is constituted by the image sensor 3, the FOP4, and the scintillator 5 described above. The control unit 30 is constituted by the control circuit 6 and the communication module 7 described above. The control unit 30 performs communication with the image pickup unit 20, communication with the control device 10, and control of the image pickup unit 20. The imaging unit 20 is electrically connected to the control unit 30 via wiring (not shown) in the housing 8. The imaging unit 20 and the control unit 30 transmit and receive (i.e., communicate) signals and the like through the wiring. The control unit 30 can communicate with the control device 10 via a wire. Specifically, the control unit 30 can communicate with the control device 10 via the cable 9 (see fig. 1).
In the imaging device 1 configured as described above, when radiation transmitted through the object enters the scintillator 5 of the control unit 30 through the wall portion 8a of the housing 8 in a state in which the housing 8 is disposed in the oral cavity, fluorescence corresponding to the intensity of the entered radiation is generated in the scintillator 5. When the fluorescence is guided by the FOP4 and enters the image sensor 3, an electrical signal corresponding to the intensity of the entered fluorescence is generated in the image sensor 3, and the electrical signal is transmitted to the control circuit 6 of the control unit 30 through the wiring in the housing 8.
The image sensor 3 of the image pickup unit 20 includes a plurality of image pickup pixels 3A and a plurality of monitoring pixels 3B. The plurality of imaging pixels 3A are arranged in two dimensions to constitute a light detection region. The plurality of monitor pixels 3B are arranged along the outer periphery of the plurality of imaging pixels 3A, for example. The number of the monitor pixels 3B may be at least 1.
The imaging unit 20 uses the plurality of imaging pixels 3A, performs imaging detection (1 st detection) for detecting radiation by acquiring an image of an object, and outputs an imaging signal (1 st signal). Specifically, when the control unit 30 controls the image sensor 3 so as to start detection for imaging, each of the imaging pixels 3A converts fluorescence emitted from the scintillator 5 by incidence of radiation into electric charges, and outputs the electric charges as an imaging signal. More specifically, the control unit 30 controls the image sensor 3 to output the electric charges generated in each of the image pickup pixels 3A as the image pickup signal by switching ON/OFF (ON/OFF) of the switch SW 1. The switch SW1 is a switch provided in the image sensor 3, and is connected to the image pickup pixel 3A and the control circuit 6. The switch SW1 is constituted by a transistor, for example.
The imaging unit 20 uses the plurality of monitoring pixels 3B, performs monitoring detection (2 nd detection) for detecting radiation to monitor the dose of radiation, and outputs a monitoring signal (2 nd signal). Specifically, when the control unit 30 controls the image sensor 3 so that detection for monitoring is started, each of the monitoring pixels 3B converts fluorescence emitted from the scintillator 5 by incidence of radiation into electric charges, and outputs the electric charges as a signal for monitoring. More specifically, the control unit 30 controls the image sensor 3 to output the electric charges generated in each of the monitoring pixels 3B as a monitoring signal by switching the on/off state of the switch SW 2. The switch SW2 is a switch provided in the image sensor 3, and is connected to the monitor pixel 3B and the control circuit 6. The switch SW2 is constituted by a transistor, for example.
The control unit 30 acquires the imaging signal and the monitoring signal from the imaging unit 20, and transmits the imaging signal and the monitoring signal to the control device 10. The control unit 30 receives a control command from the control device 10, and controls the imaging unit 20 in accordance with the control command. The control instruction includes a 1 st start instruction, a 2 nd start instruction, and an end instruction. The 1 st start command is a command for starting detection for acquiring a signal for monitoring. When receiving the 1 st start command from the control device 10, the control unit 30 performs detection for monitoring. Specifically, the control unit 30 controls the imaging unit 20 so that the accumulation of the electric charges by each of the monitoring pixels 3B starts as described above. The control unit 30 ends the detection for monitoring at a timing when a predetermined period elapses, for example. Specifically, the control unit 30 controls the imaging unit 20 so that the accumulation of the electric charges by each of the monitoring pixels 3B ends as described above. When the monitoring detection is completed and the monitoring signal is acquired from the imaging unit 20, the control unit 30 transmits the monitoring signal to the control device 10. More specifically, the control unit 30 converts the monitoring signal acquired from the imaging unit 20 into a signal according to the communication protocol of the USB standard, and transmits the converted monitoring signal to the control device 10. That is, when the 1 st start instruction is received from the control device 10, the control unit 30 starts monitoring the dose of radiation at the imaging unit 20, ends the monitoring at a timing when a predetermined period elapses, and transmits a monitoring signal as a result of the monitoring to the control device 10.
The 2 nd start instruction is an instruction for starting imaging detection for acquiring an imaging signal. The end instruction is an instruction to end the imaging detection. When receiving the 2 nd start instruction from the control device 10, the control unit 30 performs image capturing detection. Specifically, the control unit 30 controls the imaging unit 20 so that the accumulation of charges by each imaging pixel 3A starts as described above. When receiving the end instruction, the control unit 30 ends the imaging detection. Specifically, the control unit 30 controls the imaging unit 20 so that the accumulation of the electric charges by each imaging pixel 3A ends as described above. When the imaging detection is completed and the imaging signal is acquired from the imaging unit 20, the control unit 30 transmits the imaging signal to the control device 10. More specifically, the control unit 30 converts the image pickup signal acquired from the image pickup unit 20 into a signal according to the communication protocol of the USB standard, and transmits the converted image pickup signal to the control device 10. That is, when receiving the 2 nd start instruction from the control device 10, the control unit 30 starts detection of the acquisition of the image for radiation at the imaging unit 20, and when receiving the end instruction, ends the detection, and transmits an imaging signal as a result of the detection to the control device 10.
[ Structure of control device ]
The control device 10 includes a storage unit 11, a communication unit 12, a processing unit 13, an input receiving unit 14, and a display unit 15. The storage unit 11 is, for example, a hard disk or the like, and stores various data. The communication unit 12 is, for example, a communication device. The processing unit 13 is, for example, a processor. The processing unit 13 executes software (program) read into a memory (not shown) or the like provided in the control device 10, and controls reading and writing of data in the memory or the like and communication by the communication unit 12. The input receiving unit 14 is an interface unit that receives input of various data from a user. The input receiving unit 14 is, for example, a keyboard, a mouse, or the like. The display unit 15 displays various information in accordance with instructions from the processing unit 13. The display unit 15 is, for example, a display device included in the control device 10. The display unit 15 may be configured as a GUI (Graphical User Interface (graphical user interface)), for example, and may function as an interface unit for receiving various data inputs from a user.
The control device 10 functions as a higher-level controller of the control unit 30. The control device 10 receives an input of an imaging condition of the object from the user. The image capturing condition is input by, for example, the user inputting object information and image capturing method information to the input receiving unit 14. In the present embodiment, the object information is the type of the object. The object is a part that is an imaging object in the oral cavity, for example, the posterior teeth and the anterior teeth. In the present embodiment, the imaging method information is a type of imaging method. The imaging method is, for example, a parallel method, a bisection method, a wing biting method, or a biting method.
When receiving an input of an imaging condition, the control device 10 generates a 1 st start command, and transmits the 1 st start command to the control unit 30 of the imaging device 1. Thereby, the control unit 30 starts detection for monitoring the dose of radiation. That is, when the user inputs the imaging condition to the control device 10, the control device 10 starts the detection for monitoring in the imaging device 1 as a process in a preceding stage for starting the acquisition of the image of the object.
Then, when receiving the monitoring signal from the control unit 30, the control device 10 generates a control command based on the monitoring signal, and transmits the generated control command to the control unit 30. Specifically, the control device 10 performs a known analysis (for example, the analysis described in japanese patent No. 5715960) of estimating the radiation dose or the like based on the monitoring signal, and when the analysis result of the analysis does not satisfy the start condition of the imaging detection, generates the 1 st start command again, and transmits the 1 st start command to the control unit 30. On the other hand, when the analysis result satisfies the start condition of the imaging detection, the control device 10 generates a 2 nd start command and transmits the 2 nd start command to the control unit 30. After transmitting the 2 nd start command to the control unit 30, the control unit 30 generates the 1 st start command again, and transmits the 1 st start command to the control unit 30. Thus, the imaging apparatus 1 starts detection for monitoring the dose of radiation and detection for capturing an image of the object. That is, the control device 10 starts detection of radiation used for acquisition of an image of an object in the imaging device 1, and continues monitoring of the dose of radiation in order to acquire an appropriate image of the object.
Then, when receiving the monitoring signal again from the control unit 30, the control device 10 generates a control command based on the monitoring signal, and transmits the generated control command to the control unit 30. Specifically, the control device 10 analyzes the dose of the radiation displayed based on the monitoring signal. The control device 10 calculates the total dose of radiation calculated based on the monitoring signal as the analysis. Specifically, the control device 10 estimates the total dose of radiation received by the plurality of imaging pixels 3A based on the monitoring signal. In the present embodiment, the correlation between the dose of radiation displayed by the monitoring signal (that is, detected by the plurality of monitoring pixels 3B) and the dose of radiation actually entering the oral cavity is calculated in advance. The control device 10 performs a well-known calculation based on the correlation (for example, a calculation described in japanese patent No. 5715960) to calculate the total dose of radiation received by the plurality of imaging pixels 3A.
The control device 10 determines whether the analyzed result satisfies the end condition of the imaging detection. Specifically, the control device 10 sets a predetermined threshold value, and determines that the end condition of the imaging detection is satisfied when the calculated total dose exceeds the threshold value. The control device 10 stores a threshold value for each imaging condition of the object in the storage unit 11. The control device 10 refers to the stored threshold value of each imaging condition of the object, and sets a threshold value corresponding to the imaging condition received by the input receiving unit 14. In the present embodiment, the control device 10 stores a threshold value for each combination of the type of the object and the type of the imaging method, and sets a threshold value corresponding to the object information and the imaging method information received by the input receiving unit 14. The detailed setting method of the threshold value will be described later.
When the analyzed analysis result does not satisfy the end condition of the imaging detection, the control device 10 generates the 1 st start command again and transmits the 1 st start command to the control unit 30. On the other hand, when the analysis result satisfies the end condition of the imaging detection, the control device 10 generates an end command and transmits the end command to the control unit 30. Thus, in the imaging apparatus 1, the imaging detection for acquiring the image of the object is completed, and the imaging signal is transmitted to the control apparatus 10. That is, the control device 10 determines an appropriate end timing of the imaging detection by performing the analysis, and ends the imaging detection performed by the imaging device 1. When receiving the image capturing signal from the control unit 30, the control device 10 generates an image of the object based on the received image capturing signal. Thereby, imaging of the object is performed.
[ image pickup processing ]
The image capturing process performed by the intraoral image capturing system 100 will be described with reference to fig. 4 and 5. Fig. 4 is a sequence diagram showing a flow of processing from the reception of an imaging condition to the start of imaging detection in the imaging processing. Fig. 5 is a sequence diagram showing a flow of processing from generation of the 1 st start instruction of the 2 nd time to acquisition of an image of an object in the image capturing process. The radiation source in the imaging process continuously irradiates X-rays of a certain intensity.
First, as shown in fig. 4, the control device 10 receives an input of an imaging condition of an object from a user (step S01). The input of the imaging conditions is performed by the user inputting object information and imaging method information to the input receiving unit 14. Next, the control device 10 sets a threshold value used for determining the end timing of the imaging detection based on the input imaging condition (step S02). The control device 10 refers to the threshold value for each imaging condition stored in the storage unit 11, and sets a threshold value corresponding to the input imaging condition. Details of the method for receiving the input of the imaging condition and setting the threshold value will be described later. Next, the control device 10 generates a 1 st start command for starting imaging detection by the plurality of monitoring pixels 3B, and transmits the 1 st start command to the control unit 30 of the imaging device 1 (step S03). The control unit 30 receives the 1 st start instruction (step S04), and controls the imaging unit 20 to start detection for monitoring in accordance with the 1 st start instruction (step S05). Specifically, the control unit 30 starts accumulation of charges by each of the monitoring pixels 3B of the imaging unit 20. Next, each monitoring pixel 3B starts accumulating electric charges (step S06). Thereby, monitoring of the dose of radiation is started on the imaging apparatus 1 side.
Next, each of the monitoring pixels 3B outputs a monitoring signal corresponding to the stored charge to the control unit 30 at a timing when the predetermined period elapses (step S07). Next, the control unit 30 receives the monitoring signals from the plurality of monitoring pixels 3B (step S08), and transmits the monitoring signals to the control device 10 (step S09). The control device 10 receives the monitoring signal from the control unit 30 (step S10), and performs a known analysis (for example, an analysis described in japanese patent No. 5715960) such as estimating the dose of radiation based on the monitoring signal (step S11). Next, the control device 10 determines whether or not the analysis result satisfies the start condition of the imaging detection (step S12). When determining that the analysis result does not satisfy the start condition of the imaging detection (no in step S12), the control device 10 returns the process to step S03. On the other hand, when it is determined that the analysis result satisfies the start condition of the imaging detection (yes in step S12), the control device 10 generates a 2 nd start instruction for starting the imaging detection, and transmits the 2 nd start instruction to the control unit 30 (step S13).
Next, the control unit 30 receives the 2 nd start instruction (step S14), and controls the imaging unit 20 to start imaging detection in accordance with the 2 nd start instruction (step S15). Specifically, the control unit 30 starts accumulation of charges by each imaging pixel 3A of the imaging unit 20. Next, each imaging pixel 3A starts accumulating electric charge (step S16). Thus, detection for acquiring an image of the object is started on the image pickup device 1 side.
Next, as shown in fig. 5, the control device 10 generates the 1 st start command again, and transmits the 1 st start command to the control unit 30 of the image pickup device 1 (step S17). The control unit 30 receives the 1 st start instruction (step S18), and controls the imaging unit 20 to start detection for monitoring in accordance with the 1 st start instruction (step S19). Next, each monitoring pixel 3B of the imaging unit 20 starts charge accumulation (step S20). As a result, the imaging device 1 detects radiation for acquiring an image of the object, and continues to monitor the dose of radiation for acquiring an appropriate image of the object.
Next, the imaging unit 20 acquires a monitoring signal at a timing when a predetermined period elapses, and outputs the monitoring signal to the control unit 30 (step S21). The control unit 30 receives the monitoring signal from the imaging unit 20 (step S22), and transmits the monitoring signal to the control device 10 (step S23). The control device 10 receives the monitoring signal from the control unit 30 (step S24), and performs analysis based on the monitoring signal (step S25). Specifically, the control device 10 calculates the total dose of radiation calculated based on the monitoring signal as the analysis. Next, the control device 10 determines whether or not the analysis result satisfies the end condition of the imaging detection (step S26). Specifically, the control device 10 determines whether or not the total dose of radiation calculated by the analysis exceeds the threshold set in step S02. When the control device 10 determines that the analysis result does not satisfy the end condition of the imaging detection (that is, the total dose of radiation does not exceed the threshold set in step S02) (step S26: no), the processing returns to step S17. On the other hand, when it is determined that the analysis result satisfies the end condition of the imaging detection (that is, the total dose of radiation exceeds the threshold set in step S02) (yes in step S26), the control device 10 generates an end instruction for ending the imaging detection performed by the plurality of imaging pixels 3A, and transmits the end instruction to the control unit 30 (step S27).
Next, the control unit 30 receives the end command (step S28), and controls the imaging unit 20 to end the imaging detection in accordance with the end command (step S29). Next, each image pickup pixel 3A ends the accumulation of the electric charge (step S30), and outputs an image pickup signal corresponding to the accumulated electric charge to the control unit 30 (step S31). Next, the control unit 30 receives the image pickup signals from the plurality of image pickup pixels 3A (step S32), and transmits the image pickup signals to the control device 10 (step S33). Next, the control device 10 receives the image pickup signal (step S34), and generates an image of the object based on the image pickup signal (step S35). Thereby, the image capturing of the object ends.
[ threshold setting Process ]
The threshold setting process performed in step S02 of the image capturing process will be described with reference to fig. 6. Fig. 6 is a flowchart showing a series of flows of the threshold setting process. On the premise, the input of the imaging condition from the user to the control device 10 is completed (see step S01 of fig. 4).
As an example, a screen for selecting the imaging method and the type of the object is displayed on the display unit 15 (see fig. 3) of the control device 10, and the user operates the input receiving unit 14 such as a mouse to select the imaging method and the type of the object, thereby inputting imaging conditions (i.e., object information and imaging method information). In the example shown in fig. 6, any one of the parallel method, the bisection method, the bite method, and the bite method is selected as the imaging method, and any one of the posterior teeth and the anterior teeth is selected as the target object. The control device 10 stores a threshold value for each combination of the type of the object and the type of the imaging method in the storage unit 11. Specifically, the control device 10 stores an appropriate threshold value for each combination of the imaging method "parallel method" and the object "front tooth" as the threshold value= "1". Specifically, in the parallel method, the bisection method, the bite wing method, and the bite method, the higher the ratio of the plurality of monitor pixels 3B to be covered by teeth, bones, or the like in the oral cavity, the higher the threshold value is set. In addition, the threshold value is set higher in the case where the object is the rear tooth than in the case where the object is the front tooth. The control device 10 refers to the inputted imaging conditions and the threshold value for each combination, and sets the threshold value in the threshold value setting process. The value of the threshold value, the type of the object, and the type of the imaging method are not limited to this example.
First, the control device 10 determines whether or not the imaging method information included in the imaging conditions indicates a parallel method or a bisection method (step S101). When determining that the imaging method information indicates the parallel method or the bisection method (yes in step S101), the control device 10 determines whether or not the object information indicates the anterior teeth (step S102). When it is determined that the object information indicates the front tooth (yes in step S102), the control device 10 sets the threshold to "1" (step S103). On the other hand, when it is determined that the object information does not indicate front teeth (in other words, the object information indicates rear teeth) (step S102: no), the control device 10 sets the threshold to "1.3" (step S104).
When it is determined in step S101 that the imaging method information does not indicate the parallel method or the bisection method (step S101: no), the control device 10 determines whether or not the imaging method information indicates the wing biting method (step S105). When the imaging device determines that the imaging method information indicates the occlusion method (step S105: yes), it determines whether or not the object information indicates the anterior teeth (step S106). When it is determined that the object information indicates the front tooth (yes in step S106), the control device 10 sets the threshold to "1.3" (step S107). On the other hand, when it is determined that the object information does not indicate front teeth (that is, the object information indicates rear teeth) (step S106: no), the control device 10 sets the threshold to "1.5" (step S108). When the control device 10 determines in step S105 that the imaging method information does not indicate the biting method (that is, the imaging method information indicates the biting method) (step S105: no), the threshold value is set to "1.7" (step S109). Through the above threshold setting process, the imaging apparatus sets a threshold corresponding to the imaging condition.
[ action and Effect ]
In the intra-oral imaging system 100 including the imaging device 1, the control device 10 receives a monitoring signal concerning the dose of radiation, and transmits a control instruction generated based on the monitoring signal to the control unit 30, and the control unit 30 receives the control instruction and controls the imaging unit 20 in accordance with the control instruction. Thus, for example, the end timing of imaging of the object can be determined according to the type of the object and/or the type of the imaging method, and as a result, the image of the object can be acquired appropriately. In the intraoral imaging system 100, the imaging unit 20 and the control unit 30 are housed in the case 8. In this way, the problem that occurs when the control unit 30 is provided separately from the imaging unit 20, that is, the problem that the control unit 30 becomes an obstacle or the like when the imaging unit 20 is disposed in the oral cavity can be avoided. In the intraoral imaging system 100, generation of a control command based on the monitoring signal is performed by the control device 10. As a result, the processing load of the control unit 30 on the image pickup apparatus 1 side can be reduced, and as a result, the image pickup apparatus 1 can be reduced in size, and heat generation of the image pickup apparatus 1 can be suppressed. As described above, according to the intraoral imaging system 100 and the imaging device 1, it is possible to achieve appropriate acquisition of an image of a subject, improvement in operability of the imaging device 1, and suppression of heat generation of the intraoral imaging device 1.
The effect of the intraoral imaging system 100 is further described. In the intraoral imaging system 100, the imaging device 1 includes a control unit 30, and the control unit 30 converts an imaging signal and a monitoring signal into signals according to a communication protocol of a general communication standard (USB standard), transmits the signals to the control device 10, and controls the imaging unit 20 in accordance with a control instruction received from the control device 10. In this way, by providing the imaging device 1 with the control unit 30 separately from the control device 10 that substantially performs control of the imaging unit 20 by generating a control instruction for control of the imaging unit 20, communication between the imaging device 1 and the control device 10 can be made to be communication according to a common communication standard. As a result, communication between the imaging apparatus 1 and the control apparatus 10 can be realized with a simple configuration. Further, when the FPGA is used as a constituent element of the control unit 30, that is, the control circuit 6, each control command received from the control device 10 can be reliably processed at an accurate timing, and cost can be reduced. In addition, it is not practical from the viewpoint of cost and the like to provide the image sensor 3 with the same function as the control unit 30 instead of providing the control unit 30 in the image pickup apparatus 1.
For example, when the control unit 30 is disposed outside the oral cavity and the imaging unit 20 is electrically connected to the control unit 30 via a first cable (not shown), and the control unit 30 is electrically connected to the control device 10 via a second cable (not shown), there is a risk of breakage or failure at the connection portions of the control unit 30 and the first cable and the connection portions of the control unit 30 and the second cable. In contrast, in the intraoral imaging system 100, the control unit 30 is stored in the case 8, and thus such a risk can be avoided. In the intraoral imaging system 100, the number of cables can be reduced as compared with the above example, and therefore the number of components can be reduced.
In the intraoral imaging system 100, various processes such as generation of a control command and analysis of a monitoring signal are performed by the control device 10, and thus, for example, various processes such as changing of imaging conditions, threshold values, and the like, and adding of them can be easily performed.
In the intraoral imaging system 100, the control device 10 generates an image of an object based on an imaging signal. This enables an image of the object to be reliably generated.
In the intraoral imaging system 100, the control command includes an end command for ending the imaging detection, and when the end command is received, the control unit 30 controls the imaging unit 20 to end the imaging detection. Thus, for example, the detection of the radiation for acquiring the image of the object can be terminated at an appropriate timing according to the type of the object and/or the type of the imaging method, and as a result, the image of the object can be acquired appropriately.
In the intraoral imaging system 100, the control device 10 calculates the total dose of radiation in the plurality of imaging pixels 3A of the image sensor 3 based on the monitoring signal, and generates an end instruction when the calculated total dose of radiation exceeds a predetermined threshold. Thus, for example, the detection of the radiation for acquiring the image of the object can be completed at an appropriate total dose according to the type of the object and/or the type of the imaging method, and as a result, the image of the object can be acquired appropriately. Further, according to the intraoral imaging system 100, the timing at which the detection processing of the radiation for acquiring the image of the object is ended is automatically adjusted in the imaging device 1 based on the monitoring signal, and therefore, adjustment of the dose of the radiation on the radiation source side and the radiation time can be made unnecessary.
In the intraoral imaging system 100, the control device 10 stores a threshold value for each imaging condition of the subject, receives an input of the imaging condition, and sets a threshold value corresponding to the imaging condition. Thus, since an appropriate threshold value is set according to the inputted imaging condition, for example, an image of the object is appropriately acquired regardless of the type of the object and/or the type of the imaging method.
In the intraoral imaging system 100, the control device 10 receives imaging conditions including object information about an object, and sets a threshold value corresponding to the object information. Accordingly, since an appropriate threshold value is set according to the object to be imaged, the image of the object can be appropriately acquired regardless of the type of the object.
In the intraoral imaging system 100, the control device 10 receives imaging conditions including imaging method information on an imaging method of an object, and sets a threshold value corresponding to the imaging method information. Accordingly, since an appropriate threshold value is set according to the imaging method of the object, the image of the object can be appropriately acquired regardless of the type of the imaging method.
In the intraoral imaging system 100, the control unit 30 can communicate with the control device 10 via a wire. This ensures a stable communication environment between the control unit 30 and the control device 10. Further, since the imaging unit 20 and the control unit 30 are housed in the single case 8, even in a configuration in which the control unit 30 and the control device 10 are physically connected by wire, it is possible to avoid a problem that the control unit 30 becomes an obstacle or the like when the imaging unit 20 is disposed in the oral cavity.
Modification example
The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments. For example, the imaging unit 20 may be a member for performing imaging detection and monitoring detection. As an example, the imaging unit 20 may be constituted by only the image sensor 3 and the scintillator 5, or the imaging unit 20 may be constituted by only a direct conversion type imaging element that generates electric charges by incidence of radiation. The control unit 30 may be configured to be communicable with the control device 10, and may receive a control command and control the imaging unit 20 in accordance with the control command. As an example, the control unit 30 may include components other than the control circuit 6 and the communication module 7, in addition to the control circuit 6 and the communication module 7, or instead of the control circuit 6 and the communication module 7. In the above embodiment, the image sensor 3 includes the plurality of imaging pixels 3A and the plurality of monitoring pixels 3B, but the image sensor 3 may be configured to include only 1 pixel region and output the imaging signal and the monitoring signal in the imaging region. In addition, the switch SW1 and the switch SW2 may be provided outside the image sensor 3.
The intraoral imaging system 100 may include a plurality of imaging devices 1. Such a plurality of imaging devices 1 can be disposed in the oral cavity of an animal, for example. Hereinafter, an example in which the intra-oral imaging system 100 includes 2 imaging devices 1 will be described. In such an intraoral imaging system 100, for example, it is assumed that one imaging device 1 is disposed on the back side in the oral cavity of an animal, and the other imaging device 1 is disposed on the front side in the oral cavity. In this case, when one of the 2 image capturing apparatuses 1 exceeds the threshold value, the control apparatus 10 transmits an end command to the control section 30 of each image capturing apparatus 1. That is, the control device 10 ends the detection of the radiation for acquiring the image of the object for the two imaging devices 1. This prevents the plurality of imaging pixels 3A of each imaging device 1 from being saturated. Therefore, according to the intraoral imaging system 100 of the present modification, even when imaging an intraoral object whose proportions of teeth and bones are greatly different from each other on the back side and the front side, the detection of radiation for acquiring an image of the object can be completed at an appropriate total dose, and as a result, the image of the object can be appropriately acquired.
The control unit 30 and the control device 10 may be configured to be capable of communication by wireless (for example, LAN, bluetooth (registered trademark), wifi, etc.).
The imaging process performed by the intraoral imaging system 100 is not limited to the above embodiment. For example, the control device 10 may set the threshold value based on one of the object information and the imaging method information, or may set the threshold value based on imaging conditions different from the object information and the imaging method information. For example, the control device 10 may generate only the end command. In this case, the control unit 30 may start the detection for monitoring at a timing when a predetermined period elapses, for example. In the intraoral imaging system 100, the control device 10 may generate other control instructions.
The steps shown in the sequence diagram (fig. 4 and 5) of the imaging method and the steps shown in the flowchart (fig. 6) of the threshold setting method may be omitted as appropriate. Further, the order of the steps may be replaced as appropriate.
Description of symbols
1 … camera, 8 … housing, 10 … control device, 20 … camera, 30 … control unit, 100 … intraoral camera system.
Claims (9)
1. An intra-oral camera system is characterized in that,
Comprising the following steps:
an imaging device configured to detect radiation transmitted through a subject in a state of being disposed in an oral cavity; and
a control device electrically connected with the image pick-up device,
the image pickup apparatus includes:
an imaging section that detects the radiation;
a control unit configured to be communicably connected to the control unit and to control the imaging unit; and
a housing for accommodating the image pickup unit and the control unit,
the imaging unit performs 1 st detection of detecting the radiation for acquiring an image of the object and 2 nd detection of detecting the radiation for monitoring a dose of the radiation,
the control unit transmits a 1 st signal obtained by the 1 st detection and a 2 nd signal obtained by the 2 nd detection to the control device,
the control device receives the 1 st signal and the 2 nd signal and transmits a control instruction generated based on the 2 nd signal to the control part,
the control part receives the control instruction and controls the image pickup part according to the control instruction.
2. The intraoral imaging system according to claim 1, wherein:
the control device generates the image of the object based on the 1 st signal.
3. An intra-oral imaging system according to claim 1 or 2, wherein:
the control instruction includes an end instruction that ends the 1 st detection,
the control unit controls the imaging unit to end the 1 st detection when the end instruction is received.
4. An intra-oral imaging system according to claim 3, wherein:
the control device generates the end instruction when the total dose of the radiation calculated based on the 2 nd signal exceeds a predetermined threshold.
5. An intraoral imaging system according to claim 4, wherein:
the control device is provided with a control unit,
storing the threshold value for each imaging condition of the object, and
and receiving an input of the imaging condition, and setting the threshold value corresponding to the imaging condition.
6. An intraoral imaging system according to claim 5, wherein:
the control device receives the imaging condition including object information about the object, and sets the threshold value corresponding to the object information.
7. An intra-oral imaging system according to claim 5 or 6, wherein:
the control device receives the imaging condition including imaging method information on an imaging method of the object, and sets the threshold value corresponding to the imaging method information.
8. The intraoral imaging system according to any one of claims 1 to 7, wherein:
the control unit may be configured to communicate with the control device via a wire.
9. An image pickup apparatus, characterized in that,
an imaging device for detecting radiation transmitted through a subject in a state of being disposed in an oral cavity,
comprising the following steps:
an imaging section that detects the radiation;
a control unit configured to be communicably connected to the control unit and to control the imaging unit; and
a housing for accommodating the image pickup unit and the control unit,
the imaging unit performs 1 st detection of detecting the radiation for acquiring an image of the object and 2 nd detection of detecting the radiation for monitoring a dose of the radiation,
the control part is provided with a control part,
transmitting the 1 st signal obtained by the 1 st detection and the 2 nd signal obtained by the 2 nd detection to the control device, and
and receiving a control instruction from the control device, and controlling the image pickup part according to the control instruction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021020625A JP7266052B2 (en) | 2021-02-12 | 2021-02-12 | Intraoral imaging system and imaging device |
| JP2021-020625 | 2021-02-12 | ||
| PCT/JP2022/000046 WO2022172646A1 (en) | 2021-02-12 | 2022-01-04 | Intra-oral imaging system and imaging apparatus |
Publications (1)
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| CN116867437A true CN116867437A (en) | 2023-10-10 |
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| CN202280014216.6A Pending CN116867437A (en) | 2021-02-12 | 2022-01-04 | Intraoral imaging system and imaging device |
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| US (1) | US20240057961A1 (en) |
| EP (1) | EP4260806A1 (en) |
| JP (1) | JP7266052B2 (en) |
| KR (1) | KR20230144540A (en) |
| CN (1) | CN116867437A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6039505Y2 (en) | 1980-07-02 | 1985-11-26 | いすゞ自動車株式会社 | Intake heating device |
| US5510623A (en) * | 1995-02-24 | 1996-04-23 | Loral Fairchild Corp. | Center readout intra-oral image sensor |
| JPH11188033A (en) * | 1997-12-26 | 1999-07-13 | Hamamatsu Photonics Kk | Dentistry x-ray image pickup device and its module |
| JP2006246961A (en) * | 2005-03-08 | 2006-09-21 | Hamamatsu Photonics Kk | X-ray imaging device |
| FR2938936B1 (en) * | 2008-11-25 | 2016-01-15 | Sopro | MULTIFUNCTION IMAGE ACQUISITION DEVICE |
| CN113677262A (en) * | 2019-04-05 | 2021-11-19 | 阿莱恩技术有限公司 | Authentication and identification of intraoral scanner sleeves |
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- 2021-02-12 JP JP2021020625A patent/JP7266052B2/en active Active
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- 2022-01-04 CN CN202280014216.6A patent/CN116867437A/en active Pending
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- 2022-01-04 US US18/267,911 patent/US20240057961A1/en active Pending
- 2022-01-04 KR KR1020237026714A patent/KR20230144540A/en unknown
- 2022-01-04 EP EP22752479.0A patent/EP4260806A1/en active Pending
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| US20240057961A1 (en) | 2024-02-22 |
| JP7266052B2 (en) | 2023-04-27 |
| EP4260806A1 (en) | 2023-10-18 |
| WO2022172646A1 (en) | 2022-08-18 |
| KR20230144540A (en) | 2023-10-16 |
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